/******************************************************************************
 * Copyright (c) 2008-2012 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#import "FileListNode.h"

@interface FileListNode (Private)

- (instancetype)initWithFolder:(BOOL)isFolder name:(NSString*)name path:(NSString*)path torrent:(Torrent*)torrent;

@end

@implementation FileListNode
{
    NSMutableIndexSet* _indexes;
    NSImage* _icon;
    NSMutableArray* _children;
}

- (instancetype)initWithFolderName:(NSString*)name path:(NSString*)path torrent:(Torrent*)torrent
{
    if ((self = [self initWithFolder:YES name:name path:path torrent:torrent]))
    {
        _children = [[NSMutableArray alloc] init];
        _size = 0;
    }

    return self;
}

- (instancetype)initWithFileName:(NSString*)name
                            path:(NSString*)path
                            size:(uint64_t)size
                           index:(NSUInteger)index
                         torrent:(Torrent*)torrent
{
    if ((self = [self initWithFolder:NO name:name path:path torrent:torrent]))
    {
        _size = size;
        [_indexes addIndex:index];
    }

    return self;
}

- (void)insertChild:(FileListNode*)child
{
    NSAssert(_isFolder, @"method can only be invoked on folders");

    [_children addObject:child];
}

- (void)insertIndex:(NSUInteger)index withSize:(uint64_t)size
{
    NSAssert(_isFolder, @"method can only be invoked on folders");

    [_indexes addIndex:index];
    _size += size;
}

- (id)copyWithZone:(NSZone*)zone
{
    //this object is essentially immutable after initial setup
    return self;
}

- (NSString*)description
{
    if (!_isFolder)
    {
        return [NSString stringWithFormat:@"%@ (%ld)", _name, _indexes.firstIndex];
    }
    else
    {
        return [NSString stringWithFormat:@"%@ (folder: %@)", _name, _indexes];
    }
}

- (NSImage*)icon
{
    if (!_icon)
    {
        _icon = [NSWorkspace.sharedWorkspace iconForFileType:_isFolder ? NSFileTypeForHFSTypeCode(kGenericFolderIcon) : _name.pathExtension];
    }
    return _icon;
}

- (NSMutableArray*)children
{
    NSAssert(_isFolder, @"method can only be invoked on folders");

    return _children;
}

- (NSIndexSet*)indexes
{
    return _indexes;
}

- (BOOL)updateFromOldName:(NSString*)oldName toNewName:(NSString*)newName inPath:(NSString*)path
{
    NSParameterAssert(oldName != nil);
    NSParameterAssert(newName != nil);
    NSParameterAssert(path != nil);

    NSArray* lookupPathComponents = path.pathComponents;
    NSArray* thesePathComponents = self.path.pathComponents;

    if ([lookupPathComponents isEqualToArray:thesePathComponents]) //this node represents what's being renamed
    {
        if ([oldName isEqualToString:self.name])
        {
            _name = [newName copy];
            _icon = nil;
            return YES;
        }
    }
    else if (lookupPathComponents.count < thesePathComponents.count) //what's being renamed is part of this node's path
    {
        lookupPathComponents = [lookupPathComponents arrayByAddingObject:oldName];
        BOOL const allSame = NSNotFound ==
            [lookupPathComponents indexOfObjectWithOptions:NSEnumerationConcurrent
                                               passingTest:^BOOL(NSString* name, NSUInteger idx, BOOL* stop) {
                                                   return ![name isEqualToString:thesePathComponents[idx]];
                                               }];

        if (allSame)
        {
            NSString* oldPathPrefix = [path stringByAppendingPathComponent:oldName];
            NSString* newPathPrefix = [path stringByAppendingPathComponent:newName];

            _path = [_path stringByReplacingCharactersInRange:NSMakeRange(0, oldPathPrefix.length) withString:newPathPrefix];
            return YES;
        }
    }

    return NO;
}

@end

@implementation FileListNode (Private)

- (instancetype)initWithFolder:(BOOL)isFolder name:(NSString*)name path:(NSString*)path torrent:(Torrent*)torrent
{
    if ((self = [super init]))
    {
        _isFolder = isFolder;
        _name = [name copy];
        _path = [path copy];

        _indexes = [[NSMutableIndexSet alloc] init];

        _torrent = torrent;
    }

    return self;
}

@end
